Battery and battery pack

Abstract

The present application relates to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises a case provided with through holes. The case comprises: a main body; pole support portions, wherein the outer periphery of the pole support portions is connected to the main body, the inner periphery of the pole support portions extends in a direction away from the main body, mounting slots are formed on the outer surfaces of the pole support portions, the wall thickness of the main body is H, and the wall thickness of each pole support portion is K; poles, arranged corresponding to the mounting slots, wherein the distance between the inner surfaces of the poles and the outer surface of the main body where the through holes are located is C, and -(H+K)≤C≤1.5 mm; and fixing structures, connected to the main body and the outer periphery of the poles, wherein the fixing structures are arranged corresponding to the mounting slots. In the present application, pole support portions are used to support posts, and the inner surfaces of the poles are provided in through holes or located outside the outer surface of a main body, that is, the inner surfaces of the poles do not extend out of the inner surfaces of the pole support portions, so that occupation of the accommodating space of an electrode set by the poles is avoided, thereby improving the space utilization rate of the battery.

Description

Battery and battery pack

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411367252.8, filed on September 29, 2024, and entitled "Battery and battery pack", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery and a battery pack. BACKGROUND

[0004] The battery generally comprises a battery internal structure and a battery external structure, the battery internal structure mainly comprises a pole group, and the battery external structure mainly comprises a battery shell, the battery shell provides a containing space for the pole group. A pole post is arranged on the battery shell, and the pole post is electrically connected with the pole group to lead out the electric quantity of the battery. However, in the prior art, the pole post usually extends out of the battery shell and into the containing space to facilitate connection with the pole group, thus causing the containing space to be additionally occupied, resulting in reduced space utilization of the battery. SUMMARY

[0005] Therefore, the present application provides a battery and a battery pack to solve the problem of low space utilization of the existing battery.

[0006] In a first aspect, the present application provides a battery, comprising a shell, the shell is provided with a through hole, the shell comprises: a main body; a pole post supporting part, the pole post supporting part is in a ring structure, the outer periphery of the pole post supporting part is connected with the main body, the inner periphery of the pole post supporting part extends away from the main body, so that the inner periphery of the pole post supporting part is surrounded to form the through hole, the outer surface of the pole post supporting part is formed with a mounting groove, the wall thickness of the main body is H, and the wall thickness of the pole post supporting part is K; a pole post is arranged corresponding to the mounting groove, the distance between the inner surface of the pole post and the outer surface of the main body where the through hole is located is C, and-(H+K)≤C≤1.5mm is satisfied, wherein the outer surface of the main body is 0, the direction inside the outer surface of the main body is negative, and the direction outside the outer surface of the main body is positive; a fixing structure is connected with the outer periphery of the main body and the pole post, and the fixing structure is arranged corresponding to the mounting groove.

[0007] Beneficial effects: the pole post is supported by the pole post supporting part, and by limiting the distance between the inner surface of the pole post and the outer surface of the main body, the inner surface of the pole post is arranged in the through hole or outside the outer surface of the main body, that is, the inner surface of the pole post will not extend out of the inner surface of the pole post supporting part, avoiding the occupation of the containing space of the pole group by the pole post, and improving the space utilization of the battery.

[0008] In an optional embodiment, the wall thickness H of the main body and the wall thickness K of the pole column supporting portion satisfy 0.5mm≤K≤H; and / or,

[0009] The distance between the outer surface of the pole column and the outer surface of the main body where the through hole is located is D, satisfying D≤3.2mm; and / or,

[0010] The outer surface of the pole column supporting portion is outwardly protruded to form a convex near one end of the through hole; the battery further comprises a sealing ring, which is arranged between the pole column and the pole column supporting portion, and has a positioning groove, the convex and the positioning groove are matched and inserted.

[0011] Beneficial effect: 0.5mm≤K≤H, while ensuring the structural strength of the pole column supporting portion, facilitating the stamping forming of the pole column supporting portion in the battery;

[0012] D≤3.2mm, which is beneficial to improve the volume energy density of the battery;

[0013] When the sealing ring is installed, the positioning groove on the sealing ring and the convex on the pole column supporting portion are matched and inserted, the positioning installation of the sealing ring is realized, the position accuracy of the sealing ring is ensured, and the limiting of the sealing ring after installation is realized, thereby ensuring the stability of the sealing ring.

[0014] In an optional embodiment, along the axial direction of the through hole, the height of the convex is h1, satisfying 0<h1≤1mm; and / or, the width of the convex from the side close to the through hole to the side away from the through hole is w, satisfying 0.3mm≤w≤2mm.

[0015] Beneficial effect: 0<h1≤1mm, avoiding that the excessive height of the convex causes the excessive thickness of the whole after the installation of the sealing ring and the pole column;

[0016] 0.3mm≤w≤2mm, facilitating the stamping forming of the convex, while avoiding occupying too much space to affect the arrangement of the remaining components of the main body or causing the increase of the overall size of the battery.

[0017] In an optional embodiment, the outer surface of the main body is provided with a groove, the groove is arranged around the pole column supporting portion and communicates with the mounting groove; the fixing structure comprises an insulating piece and a supporting ring, the supporting ring is arranged corresponding to the mounting groove and is welded with the main body to form a weld, the weld is adapted to protrude into the groove, and the insulating piece is connected with and located between the pole column and the supporting ring.

[0018] Beneficial effect: by setting the groove to accommodate the weld, avoid the weld protruding from the outer surface of the main body to affect the assembly of the remaining components.

[0019] In an alternative embodiment, along the axial direction of the through hole, the depth of the groove is h2, satisfying 0.1mm≤h2≤0.5mm.

[0020] Beneficial effect: make 0.1mm≤h2≤0.5mm, while ensuring that the weld has enough height to accommodate, avoid weakening the rigidity of the main body.

[0021] In an alternative embodiment, along the width direction of the battery, the maximum width between the two side edges of the groove is B, and the planar width of the face of the main body where the groove is located is A, satisfying 15%≤B / A≤90%.

[0022] Beneficial effect: make 15%≤B / A≤90%, while ensuring that the pole has enough surface area to be welded with the pole group, facilitate the processing and forming of the main body and the quality of the film of the main body.

[0023] In an alternative embodiment, the main body is provided with an explosion-proof valve hole, the explosion-proof valve hole is a stepped hole to form a stepped structure on the main body; the battery further comprises an explosion-proof valve, the explosion-proof valve is arranged in the explosion-proof valve hole and connected with the stepped structure, and the explosion-proof valve is arranged on the outer surface corresponding to the stepped structure or the inner surface corresponding to the stepped structure.

[0024] In an alternative embodiment, the outer surface of the main body is outwardly protruding near the edge of the explosion-proof valve hole to form a blocking part, and the blocking part is arranged along the circumferential direction of the explosion-proof valve hole.

[0025] Beneficial effect: by setting the blocking part, prevent the electrolyte or other liquid from flowing to the explosion-proof valve to cause pollution of the explosion-proof valve.

[0026] In an alternative embodiment, the shell is a cover plate or a shell.

[0027] In a second aspect, the application also provides a battery pack comprising the above-mentioned battery. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application;

[0030] Figure 2 is a top view of the battery shown in Figure 1 ;

[0031] Figure 3 is a schematic diagram of a cross-sectional structure along line X-X in Figure 2;

[0032] Figure 4 is a schematic diagram of a partial enlargement of I in Figure 3;

[0033] Figure 5 is a schematic diagram of dimensioning of the structure shown in Figure 4;

[0034] Figure 6 is a schematic diagram of a structure of a main body and an explosion-proof valve according to an embodiment of the present application;

[0035] Figure 7 is a top view of the main body and the explosion-proof valve shown in Figure 6;

[0036] Figure 8 is a schematic diagram of a cross-sectional structure along line Y-Y in Figure 7;

[0037] Figure 9 is a schematic diagram of a partial enlargement of E in Figure 8;

[0038] Figure 10 is a schematic diagram of a partial enlargement of F in Figure 8;

[0039] Figure 11 is a schematic diagram of another structure of Figure 10;

[0040] Figure 12 is a schematic diagram of a structure of another main body and another explosion-proof valve according to an embodiment of the present application;

[0041] Figure 13 is a top view of the main body and the explosion-proof valve shown in Figure 12;

[0042] Figure 14 is a schematic diagram of a cross-sectional structure along line Z-Z in Figure 13;

[0043] Figure 15 is a schematic diagram of a partial enlargement of G in Figure 14;

[0044] Figure 16 is a schematic diagram of another structure of Figure 15;

[0045] Figure 17 is a schematic diagram of a structure of a sealing ring in Figure 3;

[0046] Figure 18 is a cross-sectional view along line J-J of the battery shown in Figure 2 with a pole group;

[0047] Figure 19 is a schematic diagram of a structure of a pole when an inner surface of the pole is located inside an outer surface of a main body according to an embodiment of the present application;

[0048] Figure 20 is a schematic diagram of a structure of a pole when an inner surface of the pole is flush with an outer surface of a main body according to an embodiment of the present application;

[0049] Figure 21 is a schematic diagram of a structure of a pole when an inner surface of the pole is located outside an outer surface of a main body according to an embodiment of the present application.

[0050] Explanation of reference signs: 1, main body; 11, through hole; 111, mounting groove; 12, groove; 13, explosion-proof valve hole; 14, step structure; 15, liquid injection port; 2, pole column support part; 3, pole column; 4, fixing structure; 41, insulating part; 42, support ring; 5, convex bump; 6, sealing ring; 61, positioning groove; 7, explosion-proof valve; 8, blocking part; 81, notch; 9, lower plastic; 100, pole group; 101, pole lug. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0052] The following will describe the embodiments of the present application in combination with FIGS. 1 to 21.

[0053] According to the embodiments of the present application, in one aspect, a battery is provided, comprising a shell, the shell being provided with a through hole 11, the shell comprising: a main body 1; a pole column support part 2, the pole column support part 2 being annular, an outer periphery of the pole column support part 2 being connected with the main body 1, an inner periphery of the pole column support part 2 extending away from the main body 1, so that the inner periphery of the pole column support part 2 is surrounded by the main body 1 to form the through hole 11, an outer surface of the pole column support part 2 being formed with a mounting groove 111; a pole column 3, corresponding to the mounting groove 111; a fixing structure 4, connecting an outer periphery of the main body 1 and the pole column 3, the fixing structure 4 being provided corresponding to the mounting groove 111. As shown in FIG. 5, a wall thickness of the main body 1 is H, a wall thickness of the pole column support part 2 is K, a distance between an inner surface of the pole column 3 and an outer surface of the main body 1 where the through hole 11 is located is C, satisfying -(H+K)≤C≤1.5mm, wherein the outer surface of the main body 1 is 0, a direction inside the outer surface of the main body 1 is negative, and a direction outside the outer surface of the main body 1 is positive.

[0054] The pole column 3 is supported by the pole column support part 2, and by limiting the distance between the inner surface of the pole column 3 and the outer surface of the main body 1, the inner surface of the pole column 3 is arranged in the through hole or outside the outer surface of the main body 1, that is, the inner surface of the pole column 3 does not extend out of the inner surface of the pole column support part 2, avoiding the pole column 3 occupying the accommodation space of the pole group 100, and improving the space utilization of the battery.

[0055] It is worth mentioning that, as shown in FIG. 5 and FIG. 19, when -(H+K)≤C<0, it indicates that the inner surface of the pole column 3 is located inside the outer surface of the main body 1, and the inner surface of the pole column 3 does not extend out of the inner surface of the pole column support part 2; as shown in FIG. 20, when C=0, it indicates that the inner surface of the pole column 3 is flush with the outer surface of the main body 1; as shown in FIG. 21, when 0<C≤1.5mm, it indicates that the inner surface of the pole column 3 is located outside the outer surface of the main body 1, and the distance between the inner surface of the pole column 3 and the outer surface of the main body 1 is not greater than 1.5mm.

[0056] It needs to be further explained that, if C<-(H+K), it is easy to cause the inner surface of the pole column 3 to extend out of the inner surface of the pole column support part 2, resulting in the occupation of the accommodation space by the pole column 3, which is not conducive to improving the volume energy density of the battery; if C>1.5mm, when the distance between the outer surface of the pole column 3 and the outer surface of the main body 1 is certain, it will cause the overall height of the pole column 3 to be small, that is, the pole column 3 is too thin, affecting the welding of the pole column 3 and the busbar.

[0057] It needs to be mentioned that the tab 101 of the pole group 100 extends into the through hole 11 and is electrically connected with the inner surface of the pole column 3; or, the tab 101 of the pole group 100 is connected with the busbar or the adapter sheet, and the busbar or the adapter sheet extends into the through hole 11 and is electrically connected with the inner surface of the pole column 3.

[0058] It is worth mentioning that the shell can be a shell or a cover plate. In the embodiment, as shown in FIG. 3, the shell is a shell, one end of the shell is provided with an opening, the inside of the shell forms an accommodation space for the pole group 100, the inner surface of the shell is the side of the shell facing the accommodation space, and the outer surface of the shell is the side of the shell away from the accommodation space; further, as shown in FIG. 3, the through hole 11 is formed on the side of the shell opposite to the opening (i.e. the side formed by the length direction and the width direction of the battery), and correspondingly, the pole column support part 2, the pole column 3 and the fixing structure 4 are also arranged on the side.

[0059] Of course, in other alternative embodiments, the shell can also be a cover plate, the cover plate is connected with the shell and seals the opening, the inner surface of the cover plate is the side of the cover plate facing the accommodation space, and the outer surface of the cover plate is the side of the cover plate away from the accommodation space.

[0060] In one embodiment, as shown in FIG. 5, the wall thickness H of the main body 1 and the wall thickness K of the pole column support part 2 satisfy 0.5mm≤K≤H. While ensuring the structural strength of the pole column support part 2, it is convenient for the pole column support part 2 to be stamped and formed in the shell. Specifically, if K<0.5mm, the wall thickness of the pole column support part 2 is too small, the structural strength is weak, and deformation is easy to occur; if K>H, the pole column support part 2 and the main body 1 cannot be stamped and formed synchronously, which is not convenient for the processing of the battery.

[0061] In one embodiment, as shown in FIG. 5, the distance between the outer surface of the pole column 3 and the outer surface of the main body 1 where the through hole 11 is located is D, which satisfies D≤3.2mm. Thus, it is beneficial to improve the battery volume energy density. Specifically, if the outer surface of the pole column 3 protrudes too much from the outer surface of the main body 1, the overall volume of the battery increases, thereby reducing the battery volume energy density.

[0062] The following checks the shell with different H and K, the checking results of the shell of the example and the shell of the comparative example are shown in Table 1 and Table 2. The shell of the example is the shell whose values of H and K meet the requirements of the example, and the shell of the comparative example is the shell whose values of H and K do not meet the requirements of the example.

[0063] Table 1 Checking results of the shell of the example

[0064] Table 2 Checking results of the shell of the comparative example

[0065] In one embodiment, as shown in FIG. 4, FIG. 5 and FIG. 9, the outer surface of the pole column support part 2 protrudes outward to form a convex 5 near one end of the through hole 11; as shown in FIG. 4 and FIG. 5, the battery further comprises a sealing ring 6, which is arranged between the pole column 3 and the pole column support part 2, as shown in FIG. 17, the sealing ring 6 has a positioning groove 61, and the convex 5 is inserted into the positioning groove 61. When installing the sealing ring 6, the positioning groove 61 on the sealing ring 6 is inserted into the convex 5 on the pole column support part 2 to realize the positioning installation of the sealing ring 6, ensure the position accuracy of the sealing ring 6, and realize the limiting of the sealing ring 6 after the installation of the sealing ring 6, thereby ensuring the stability of the sealing ring 6.

[0066] It should be noted that, as shown in FIG. 6, FIG. 7, FIG. 12 and FIG. 13, the convex 5 is arranged in a whole circle in the circumferential direction, and correspondingly, the positioning groove 61 is also arranged in a whole circle on the sealing ring 6 to cooperate with the convex 5. Of course, in other alternative embodiments, the convex 5 can be only partially arranged at one end of the pole column support part 2 near the through hole 11, that is, arranged in one section or several sections, and correspondingly, the positioning groove 61 can also be arranged in one section or several sections on the sealing ring 6.

[0067] It should be noted that, as shown in FIG. 4, the inner circle of the sealing ring 6 extends from the inner wall of the pole column support part 2 near the through hole 11 (i.e. the inner circumference of the pole column support part) to the inside of the through hole 11; further, as shown in FIG. 18, the battery further comprises a lower plastic 9, which is arranged corresponding to the inner surface of the main body 1, the lower plastic 9 is provided with a communication hole, the communication hole is arranged in communication with the through hole 11, and the part of the lower plastic 9 located at the edge of the communication hole extends into the through hole 11 and abuts against the sealing ring 6.

[0068] In one embodiment, as shown in FIG. 9, the height of the convex bump 5 along the axial direction of the through hole 11 is h1, which satisfies 0 < h1≤ 1 mm. Making 0 < h1≤ 1 mm can avoid the height of the convex bump 5 being too large, which can cause the overall thickness of the battery to be too large after the sealing ring 6 and the pole column 3 are installed.

[0069] It is worth noting that the axial direction of the through hole 11 is the thickness direction of the main body 1.

[0070] In one embodiment, as shown in FIG. 9, the width of the convex bump 5 from the side close to the through hole 11 to the side away from the through hole 11 is w, which satisfies 0.3 mm≤ w≤ 2 mm. Making 0.3 mm≤ w≤ 2 mm can facilitate the stamping forming of the convex bump 5, while avoiding occupying too much space to affect the arrangement of the remaining components of the main body 1 or causing the overall size of the battery to increase. Specifically, if w is too small, it is not convenient for the processing and forming of the convex bump 5; if w is too large, it will occupy too much width of the installation groove 111, causing the installation space of the sealing ring 6 and the fixing structure 4 to decrease, which is not conducive to the arrangement of the sealing ring 6 and the fixing structure 4. However, if enough installation space is left for components such as the sealing ring 6 and the fixing structure 4, the length and width of the main body 1 will increase, which will cause the overall size of the battery to be too large.

[0071] It is worth noting that the through hole 11 can be square, or circular, or oval (track-shaped). Please refer to FIG. 9, the width of the convex bump 5 is the distance from the left side to the right side of the convex bump 5.

[0072] In one embodiment, as shown in FIG. 4 and FIG. 9, the outer surface of the main body 1 is provided with a groove 12, the groove 12 is arranged around the pole column support part 2 and communicates with the installation groove 111; the fixing structure 4 includes an insulating piece 41 and a support ring 42, the support ring 42 is arranged corresponding to the installation groove 111 and is welded with the main body 1 to form a weld, the weld is adapted to protrude into the groove 12, and the insulating piece 41 is connected with and located between the pole column 3 and the support ring 42. By arranging the groove 12 to accommodate the weld, the weld is prevented from protruding from the outer surface of the main body 1 to affect the assembly of the remaining components.

[0073] Specifically, as shown in FIG. 4, the lower ring body of the support ring 42 is arranged in the installation groove 111, and the outer periphery of the lower ring body is welded with the main body 1.

[0074] It is worth noting that the insulating piece 41 is an upper plastic formed by injection molding, which connects the pole column 3 and the support ring 42.

[0075] In one embodiment, as shown in FIG. 9, along the axial direction of the through hole 11, the depth of the groove 12 is h2, satisfying 0.1 mm≤h2≤0.5 mm. By making 0.1 mm≤h2≤0.5 mm, while ensuring that there is sufficient height to accommodate the weld, the rigidity of the main body 1 is not weakened too much. Specifically, if h2 is too small, the weld is likely to extend out of the groove 12, still affecting the assembly of the remaining components on the main body 1; if h2 is too large, the rigidity of the main body 1 will be greatly weakened, affecting the safety and stability of the battery.

[0076] In one embodiment, as shown in FIG. 7, along the width direction of the battery, the maximum width between the two side edges of the groove 12 is B, and the planar width of the side of the main body 1 where the groove 12 is located is A, satisfying 15%≤B / A≤90%. By making 15%≤B / A≤90%, while ensuring that the pole 3 has sufficient surface area to be welded with the pole group 100, it is convenient for the main body 1 to be processed and formed, and the quality of the film covering the main body 1. If B / A is too small, i.e. the area left for the through hole 11 is too small, resulting in the size of the pole 3 being too small, so the area of the pole 3 used for electrical connection with the pole group 100 is also too small, which is not convenient for the pole 3 to be electrically connected with the pole group 100 by welding, and the heat generated by welding is likely to cause the upper plastic to melt; if B / A is too large, i.e. the size of the groove 12 along the width direction is too large, then the remaining edge size along the width direction is too small, which is not convenient for the main body 1 to be processed and formed, and the insulating film covering the outside of the battery is likely to be warped.

[0077] It is worth noting that, referring to FIG. 7, for the shell of the present embodiment, the side of the groove 12 along the width direction of the battery (i.e. the width direction of the shell) forms a rounded structure, the radius of the rounded structure is r, and the outer width of the shell is L, satisfying A=L-2R.

[0078] Of course, for the cover plate in other alternative embodiments, A is the width of the cover plate.

[0079] The assembly of shells with different B / A in the assembly process is observed as follows, and the observation results of the example shell and the comparative shell are shown in Table 3. The example shell is the shell whose B / A satisfies the requirements of the present embodiment, and the comparative shell is the shell whose B / A does not satisfy the requirements of the present embodiment.

[0080] Table 3 Observation results of example shell and comparative shell

[0081] In one embodiment, as shown in FIGS. 6-16, the main body 1 is provided with an explosion-proof valve hole 13, which is a stepped hole to form a stepped structure 14 on the main body 1; the battery further comprises an explosion-proof valve 7, which is arranged in the explosion-proof valve hole 13 and connected with the stepped structure 14.

[0082] In one embodiment, as shown in FIGS. 10 and 11, the explosion-proof valve 7 is arranged corresponding to the outer surface of the stepped structure 14. Specifically, as shown in FIG. 10, the explosion-proof valve 7 is welded with the stepped structure 14 by laser penetration welding; or, as shown in FIG. 11, the edge of the explosion-proof valve 7 is welded with the corresponding edge of the main body 1 in the explosion-proof valve hole 13 by laser lap welding.

[0083] As an alternative embodiment, as shown in FIGS. 15 and 16, the explosion-proof valve 7 is arranged corresponding to the inner surface of the stepped structure 14. Specifically, as shown in FIG. 15, the explosion-proof valve 7 is welded with the stepped structure 14 by laser penetration welding; or, as shown in FIG. 16, the edge of the explosion-proof valve 7 is welded with the corresponding edge of the main body 1 in the explosion-proof valve hole 13 by laser lap welding.

[0084] It is worth noting that the explosion-proof valve 7 has a notch. Referring to FIGS. 6 and 7, after the explosion-proof valve 7 is welded with the main body 1, the notch of the explosion-proof valve 7 is arranged towards the outside of the main body 1; or, referring to FIGS. 12 and 13, after the explosion-proof valve 7 is welded with the main body 1, the notch of the explosion-proof valve 7 can also be arranged towards the inside of the main body 1.

[0085] It is noted that, as shown in FIGS. 2, 7 and 13, the explosion-proof valve hole 13 has an oblong (racetrack) structure. In one embodiment, as shown in FIGS. 2, 7 and 13, the long axis of the oblong structure is arranged along the width direction of the battery. Of course, in other alternative embodiments, the long axis of the oblong structure can also be arranged along the length direction of the battery.

[0086] In one embodiment, as shown in FIGS. 15 and 16, the outer surface of the main body 1 is outwardly protruded near the edge of the explosion-proof valve hole 13 to form a blocking part 8, which is arranged along the circumferential direction of the explosion-proof valve hole 13. By arranging the blocking part 8, the electrolyte or other liquid is prevented from flowing to the explosion-proof valve 7 to cause the pollution of the explosion-proof valve 7.

[0087] In one embodiment, the battery further comprises an explosion-proof valve patch, which is pasted on the main body 1 and covers the explosion-proof valve hole 13. It is worth noting that the main body 1 is provided with a notch 81, and the explosion-proof valve hole 13 is communicated with the outside through the notch 81. Therefore, when the explosion-proof valve 7 is subjected to helium detection, it can be judged whether the explosion-proof valve 7 leaks through the notch 81 to prevent the explosion-proof valve 7 from leaking and killing.

[0088] It is worth mentioning that in the present embodiment, the explosion-proof valve patch can also be attached to the blocking portion 8, and the notch 81 can be formed on the blocking portion 8.

[0089] In one embodiment, as shown in FIGS. 1, 6 and 12, the main body 1 is provided with a liquid injection port 15. It is worth mentioning that the liquid injection port 15 can be formed on the shell or the cover plate.

[0090] According to the embodiments of the present application, in another aspect, a battery pack is also provided, comprising the above-mentioned battery.

[0091] Although the embodiments of the present application are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A battery, characterized by, The battery comprises a shell, a main body, a pole post supporting part, a pole post, a fixing structure, and a sealing ring. The pole post supporting part is annular, and the outer periphery of the pole post supporting part is connected with the main body. The inner periphery of the pole post supporting part extends away from the main body, so that the inner periphery of the pole post supporting part surrounds the through hole. The outer surface of the pole post supporting part is provided with a mounting groove. The wall thickness of the main body is H, and the wall thickness of the pole post supporting part is K.

2. The battery of claim 1, wherein, The distance between the inner surface of the pole post and the outer surface of the main body is C. The distance between the outer surface of the pole post and the outer surface of the main body is D. The outer surface of the pole post supporting part is outwardly convex at one end near the through hole to form a convex part.

3. The battery of claim 2, wherein, The sealing ring is arranged between the pole post and the pole post supporting part.

4. The battery according to any one of claims 1 to 3, characterized in that, The sealing ring is provided with a positioning groove.

5. The battery of claim 4, wherein, The convex part is inserted into the positioning groove.

6. The battery of claim 4, wherein, The outer surface of the main body is provided with a groove.

7. The battery of any one of claims 1 to 3, wherein, The groove surrounds the pole post supporting part and is in communication with the mounting groove.

8. The battery of claim 7, wherein, The fixing structure comprises an insulating part and a supporting ring.

9. The battery of any one of claims 1 to 3, wherein, The supporting ring is arranged corresponding to the mounting groove and is welded with the main body to form a weld.

10. A battery pack, characterized by, The weld is adapted to protrude into the groove. The insulating part is connected with the pole post and the supporting ring and is located between the pole post and the supporting ring. The depth of the groove is h2 along the axial direction of the through hole. The maximum width between the two side edges of the groove is B along the width direction of the battery. The planar width of one side of the main body where the groove is located is A. The main body is provided with an explosion-proof valve hole. The explosion-proof valve hole is a stepped hole to form a stepped structure on the main body. The battery further comprises an explosion-proof valve. The explosion-proof valve is arranged in the explosion-proof valve hole and is connected with the stepped structure. The outer surface of the explosion-proof valve corresponding to the stepped structure is arranged or the inner surface of the explosion-proof valve corresponding to the stepped structure is arranged. The outer surface of the main body is outwardly convex near the edge of the explosion-proof valve hole to form a blocking part. The blocking part is arranged along the circumferential direction of the explosion-proof valve hole. The shell is a cover plate or a shell. The battery comprises the battery of claim 9.

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